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Relating contact conditions to abrasive wear
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Tribologi.ORCID iD: 0000-0003-2489-0688
2006 (English)In: Wear, ISSN 0043-1648, E-ISSN 1873-2577, Vol. 261, no 1, 74-78 p.Article in journal (Refereed) Published
Abstract [en]

Damage caused by particles within rolling/sliding contacts can severely reduce the operational life of machinery such as roller bearings, gears and pumps. Abrasive wear of spherical roller thrust bearings has been studied using a stylus apparatus and scanning electron microscopy (SEM). Both a standard bearing and a bearing with rollers coated with metal mixed amorphous carbon (Me-C:H) were studied. The SEM measurements were performed systematically across the contact surfaces so that surfaces with gradually different contact situations could be examined. These measurements were compared to the measured wear depth of the components of the roller bearing. Also, the calculated contact conditions in terms of creep, contact size and surface separation have been related to the observed wear pattern at various locations. To attempt to understand the wear behaviour of the bearing with coated rollers, the coating as well as the material content of the surfaces were examined using both SEM and energy dispersive X-ray spectrometry (EDS). This revealed that the coating did not flake off but rather was scratched off. It is possible to link the abrasive wear behaviour to the contact conditions. It is crucial to understand this relationship when building a simulation model of abrasive wear.

Place, publisher, year, edition, pages
2006. Vol. 261, no 1, 74-78 p.
Keyword [en]
Abrasive wear, Contact conditions, Particles, Roller bearings
National Category
Engineering and Technology
URN: urn:nbn:se:kth:diva-4917DOI: 10.1016/j.wear.2005.09.024ISI: 000238856200012ScopusID: 2-s2.0-33746877487OAI: diva2:7016
QC 20100928. Uppdaterad från Accepted till Published (20100928). Conference: 11th Nordic Symposium on Tribology. NORWAY. JUN 01-03, 2004Available from: 2005-02-09 Created: 2005-02-09 Last updated: 2011-12-15Bibliographically approved
In thesis
1. On wear in rolling/sliding contacts
Open this publication in new window or tab >>On wear in rolling/sliding contacts
2005 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

The aim of this thesis is to increase the understanding of wear in rolling/sliding contacts such as the wheel-rail contact for railroads and the roller-washer contact for roller bearings.

The Stockholm commuter train network has been the subject of papers A and B in this thesis in which the wear and surface cracks on rails has been observed for a period of three years. By comparing the wear depth with the crack length, equilibrium between these two damage mechanisms was found for a lubricated rail. By using a lubricant with friction modifiers the stresses was low enough to prevent crack propagation; at the same time, the rail was hard enough to reduce the wear rate. This is probably the most favourable state in terms of rail maintenance cost.

Roller bearings subjected to lubricant borne particles have been the subject of papers C, D and E in this thesis. Particles in the lubricating oil can have a significant impact on the wear in lubricated contacts. Even at low concentration levels can self-generated particles cause significant wear. The here presented results shows that filtration during run-in can significantly reduce both the mass loss and the number of self generated particles. A series of experiments has been carried out to study the wear of roller bearings by ingested lubricant borne hard particles. The form of the worn profile and the length of wear scratches correspond closely to the sliding within the contact. A count of the number of wear scratches on the rolling element surface indicates that the contact concentrates particles. A novel wear model based on the observation of a single point on the contacting surface when a concentration of particles passes through it has been developed and the necessary data for the model has been determined from the experiments. Comparison of the simulation results with the experimental results shows good qualitative agreement for the form change of the washer surfaces.

Place, publisher, year, edition, pages
Stockholm: KTH, 2005. x, 20 p.
Trita-MMK, ISSN 1400-1179 ; 2005:03
Technology, wear, rolling, sliding, contact, environment, TEKNIKVETENSKAP
National Category
Engineering and Technology
urn:nbn:se:kth:diva-122 (URN)
Public defence
2005-02-11, Kollegiesalen, Valhallavägen 79, Stockholm, 09:30
QC 20101015Available from: 2005-02-09 Created: 2005-02-09 Last updated: 2012-01-27Bibliographically approved

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